Getting over the fear of a Decade can be a challenge. Jumping over the head tube is the hardest part about doing a decade. You have to committee to it and you can’t second guess yourself while in the middle of it.
A great way to learn to get over your fears is to start off on the ground and lock your back brakes and put your foot on the seat post. Then boost your self over the head tube and land on the ground on the other side of the bike. Keep doing this until you feel comfortable. This is a great way to get you used to being in the air with out a whole bunch of commitment. Simply jump to the other side on the ground until you feel ready to go for it!
Now go pull some decades!